"Randomly selected moderators assign points of either −1 or +1 to each comment, based on whether the comment is perceived as either normal, offtopic, insightful

"Randomly selected moderators assign points of either −1 or +1 to each comment, based on whether the comment is perceived as either normal, offtopic, insightful, redundant, interesting, or troll (among others)."(Wikipedia) Interesting approach...